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101 lines
3.7 KiB
Objective-C
101 lines
3.7 KiB
Objective-C
/* This file provided by Facebook is for non-commercial testing and evaluation
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* purposes only. Facebook reserves all rights not expressly granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#import "BlurbNode.h"
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#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
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#import <AsyncDisplayKit/ASHighlightOverlayLayer.h>
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static CGFloat kTextPadding = 10.0f;
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static NSString *kLinkAttributeName = @"PlaceKittenNodeLinkAttributeName";
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@interface BlurbNode () <ASTextNodeDelegate>
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{
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ASTextNode *_textNode;
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}
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@end
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@implementation BlurbNode
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- (instancetype)init
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{
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if (!(self = [super init]))
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return nil;
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// create a text node
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_textNode = [[ASTextNode alloc] init];
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// configure the node to support tappable links
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_textNode.delegate = self;
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_textNode.userInteractionEnabled = YES;
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_textNode.linkAttributeNames = @[ kLinkAttributeName ];
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// generate an attributed string using the custom link attribute specified above
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NSString *blurb = @"kittens courtesy placekitten.com \U0001F638";
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NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:blurb];
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[string addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Light" size:16.0f] range:NSMakeRange(0, blurb.length)];
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[string addAttributes:@{
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kLinkAttributeName: [NSURL URLWithString:@"http://placekitten.com/"],
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NSForegroundColorAttributeName: [UIColor grayColor],
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NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle | NSUnderlinePatternDot),
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}
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range:[blurb rangeOfString:@"placekitten.com"]];
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_textNode.attributedString = string;
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// add it as a subnode, and we're done
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[self addSubnode:_textNode];
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return self;
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}
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- (void)didLoad
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{
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// enable highlighting now that self.layer has loaded -- see ASHighlightOverlayLayer.h
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self.layer.as_allowsHighlightDrawing = YES;
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[super didLoad];
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}
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- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
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{
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// called on a background thread. custom nodes must call -measure: on their subnodes in -calculateSizeThatFits:
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CGSize measuredSize = [_textNode measure:CGSizeMake(constrainedSize.width - 2 * kTextPadding,
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constrainedSize.height - 2 * kTextPadding)];
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return CGSizeMake(constrainedSize.width, measuredSize.height + 2 * kTextPadding);
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}
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- (void)layout
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{
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// called on the main thread. we'll use the stashed size from above, instead of blocking on text sizing
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CGSize textNodeSize = _textNode.calculatedSize;
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_textNode.frame = CGRectMake(roundf((self.calculatedSize.width - textNodeSize.width) / 2.0f),
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kTextPadding,
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textNodeSize.width,
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textNodeSize.height);
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}
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- (BOOL)textNode:(ASTextNode *)richTextNode shouldHighlightLinkAttribute:(NSString *)attribute value:(id)value atPoint:(CGPoint)point
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{
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// opt into link highlighting -- tap and hold the link to try it! must enable highlighting on a layer, see -didLoad
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return YES;
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}
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- (void)textNode:(ASTextNode *)richTextNode tappedLinkAttribute:(NSString *)attribute value:(NSURL *)URL atPoint:(CGPoint)point textRange:(NSRange)textRange
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{
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// the node tapped a link, open it
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[[UIApplication sharedApplication] openURL:URL];
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}
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@end
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